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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8c2e52ebbe88 eventpoll: don't decrement ep refcount while .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=177cea8c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12e99bd4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1702c0f0580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-8c2e52eb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fd9c3cb36878/vmlinux-8c2e52eb.xz kernel image: https://storage.googleapis.com/syzbot-assets/0f323b0a9d42/bzImage-8c2e52eb.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/d0ab42c91b28/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=14e99bd4580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com (syz.0.16,5478,0):ocfs2_truncate_log_needs_flush:5830 ERROR: bug expression: le16_to_cpu(tl->tl_used) > le16_to_cpu(tl->tl_count) (syz.0.16,5478,0):ocfs2_truncate_log_needs_flush:5830 ERROR: slot 0, invalid truncate log parameters: used = 128, count = 39 ------------[ cut here ]------------ kernel BUG at fs/ocfs2/alloc.c:5830! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5478 Comm: syz.0.16 Not tainted 6.16.0-rc5-syzkaller-00053-g8c2e52ebbe88 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:ocfs2_truncate_log_needs_flush+0x2d8/0x2e0 fs/ocfs2/alloc.c:5827 Code: 0f b7 00 4c 89 e7 48 c7 c6 35 c0 a6 8d ba c6 16 00 00 48 c7 c1 c0 23 ca 8b 45 89 e8 45 89 f9 50 e8 5d 11 1e 00 48 83 c4 08 90 <0f> 0b 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90002c7f540 EFLAGS: 00010292 RAX: c11493c73e537600 RBX: ffff888031704174 RCX: c11493c73e537600 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc90002c7f610 R08: ffffc90002c7f107 R09: 1ffff9200058fe20 R10: dffffc0000000000 R11: fffff5200058fe21 R12: ffffc90002c7f5a0 R13: 0000000000000000 R14: 1ffff11007d6bf58 R15: 0000000000000080 FS: 000055557c057500(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001400 CR3: 000000004f209000 CR4: 0000000000352ef0 Call Trace: ocfs2_xattr_set+0xaea/0x11f0 fs/ocfs2/xattr.c:3624 __vfs_setxattr+0x439/0x480 fs/xattr.c:200 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x274/0x600 fs/xattr.c:665 path_setxattrat+0x364/0x3a0 fs/xattr.c:713 __do_sys_setxattr fs/xattr.c:747 [inline] __se_sys_setxattr fs/xattr.c:743 [inline] __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:743 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0edcd8e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd28be2a78 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007f0edcfb5fa0 RCX: 00007f0edcd8e929 RDX: 0000200000001400 RSI: 0000200000000240 RDI: 00002000000001c0 RBP: 00007f0edce10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000841 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0edcfb5fa0 R14: 00007f0edcfb5fa0 R15: 0000000000000005 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_truncate_log_needs_flush+0x2d8/0x2e0 fs/ocfs2/alloc.c:5827 Code: 0f b7 00 4c 89 e7 48 c7 c6 35 c0 a6 8d ba c6 16 00 00 48 c7 c1 c0 23 ca 8b 45 89 e8 45 89 f9 50 e8 5d 11 1e 00 48 83 c4 08 90 <0f> 0b 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90002c7f540 EFLAGS: 00010292 RAX: c11493c73e537600 RBX: ffff888031704174 RCX: c11493c73e537600 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc90002c7f610 R08: ffffc90002c7f107 R09: 1ffff9200058fe20 R10: dffffc0000000000 R11: fffff5200058fe21 R12: ffffc90002c7f5a0 R13: 0000000000000000 R14: 1ffff11007d6bf58 R15: 0000000000000080 FS: 000055557c057500(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001400 CR3: 000000004f209000 CR4: 0000000000352ef0 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup